Bonding device and anchorage for shielded cables

ABSTRACT

A bonding device and method for attachment to shielded electrical cables and effective in bonding the shields to a grounding conductor or to another cable shield and utilizing the strength of the cable sheath as an anchorage for the bonding device and for dead-ending the cable or cables themselves. The device comprises a one-piece, U-shaped conductive clip assembled astride the edge of the shield and sheath and having burrs which penetrate into at least the shield as an assembly bolt or stud for the clip is tightened after being inserted through aligned holes of all components. This bolt may also pass through a terminal strip or anchorage for the cable as well as through a pair of cable sheaths superimposed in back-to-back relationship.

United States Patent [1 1 Gillemot et al.

[ BONDING DEVICE AND ANCHORAGE FOR SHIELDED CABLES [76] Inventors:George W. Gillemot, 2331 20th St., Santa Monica, Calif. 90405; John T.Thompson, 244 Loring St., Los Angeles, Calif. 90024 22 Filed: Aug. 2,1971 21 Appl. No.: 168,164

[52] US. Cl 174/78, l74/79.88 R, 29/628, 339/14 R, 339/95 A, 339/97 R,24/153 UC [51] Int. Cl H02g 15/08 [58] Field of Search 174/78, 88 S, 88R, 174/75 C, 51, 87, 84 C, 79; 24/153 UC, 67.9,

DIG. 9, 87 R; 29/628 [56] References Cited UNITED STATES PATENTS3,083,349 3/1963 Blonder 339/14 L 3,303,266 2/1967 Thompson 174/84 C1,030,883 7/1912 Fuller 24/153 UC UX 3,253,247 5/1966 Vos 339/95 R Dec.4, 1973 3,435,124 3/1969 Channell l74/5l X 3,499,972 3/1970 Smith 174/88R FOREIGN PATENTS OR APPLICATIONS 869,8]3 6/l96l Great Britain 339/14 LPrimary Examiner-Darrell L. Clay Att0rneyW. D. Sellers et al.

[5 7 ABSTRACT A bonding device and method for attachment to shieldedelectrical cables and effective in bonding the shields to a groundingconductor or to another cable shield and utilizing the strength of thecable sheath as an anchorage for the bonding device and for deadendingthe cable or cables themselves. The device comprises a one-piece,U-shaped conductive clip assembled astride the edge of the shield andsheath and having burrs which penetrate into at least the shield as anassembly bolt or stud for the clip is tightened after being insertedthrough aligned holes of all components. This bolt may also pass througha terminal strip or anchorage for the cable as well as through a pair ofcable sheaths superimposed in back-to-back relationship.

20 Claims, 7 Drawing Figures BONDING DEVICE AND ANCHORAGE FOR SHIELDEDCABLES This invention relates to cable terminal fittings and groundingdevices, and more particularly to a simple, highly effective bondingdevice and method for making a strong, highly reliable, electricalconnection to a shielded cable and usable additionally as an anchoragefor the cable itself.

Many proposals have been made heretofore for connecting a heavy dutygrounding wire or other conductor to the thin foil-like shielding jacketcommonly employed between a cable sheath and its conductors. Oftentimesthe interior surface of the shield is coated with a non-conductiveinsulative film difficult to remove without risk of damage to the shielditself. The bonding problem is particularly pronounced as respectscables of smaller size having only a limited number of conductors andcustomarily enclosed by a heavy tough sheath of thermoplastic material.

By the present invention there is provided a simple, rugged, bondingcoin or device comprising a U-shape clip of conductive material having amultiplicity of sharp burrs protruding from the inner surfaces of itslegs in the area surrounding holes for a clamping stud or bolt.Preparatoryto its installation, a short length of the cable sheath andshield is slit lengthwise from one end and perforated for assemblytherethrough of a clamping stud or bolt. The clip is assembled astridethe edge of the cable sheath and shield and then firmly tightenedcausing the burrs to penetrate into both the shield and the sheath. Thewide area pressure contact between the shield, sheath and clip providesan excellent electrical connection with the shield and utilizing thestrength of the tough, strong cable sheath to sustain and transmit heavytensile stresses without risk of damaging the shield or interfering withthe integrity of its connection to the bonding clip. If desired, a pairof cable sheaths can be clamped back-to-back between the clip legs withthe burrs on each leg penetrating into a respective one of the cableshields thereby bonding the shields to one another and, if desired, to aheavy duty grounding conductor as well. The tightening of the clip boltmay also be utilized to hold the cable ends anchored to a terminal stripor to any other suitable anchorage for the cables. The clamping bolt orstud may have one end suitably bonded or swaged to a leg of the clipthereby providing a one-piece bonding assembly.

Accordingly, it is a primary object of the present invention to providean improved bonding device and method of unusual versatility for use inmaking a strong electrical and mechanical connection to the shield andsheath of a shielded electrical cable.

Another object of the invention is the provision of a one-piece, bondingclip adapted to be assembled astride the edge of a shielded cable sheathand clamped rigidly thereto.

Another object of the invention is the provision of a bonding clip forshielded electrical cables comprising a U-shaped conductive memberprovided with a multiplicity of sharp edged burrs protruding from theinner surface of one or both legs and adapted to penetrate into a cableshield jacket as the legs are compressed thereagainst.

Another object of the invention is the provision of an improved methodof providing a combined electrical connection and dead end anchorage forthe end of a shielded cable and adapted to be clamped astride theterminal end of one or more slit and flattened cable sheath and shieldjackets.

These and other more specific objects will appear upon reading thefollowing specification and claims and upon considering in connectiontherewith the attached drawing to which they relate.

Referring now to the drawing in which a preferred embodiment of theinvention is illustrated:

FIG. 1 is a perspective view of a shielded cable under preparation forassembly of the invention bonding device thereto;

FIG. 2 is an exploded perspective view showing a pair of cable endshaving their sheaths opened and arranged back-to-back with the inventionbonding clip in readiness for assembly thereastride;

FIG. 3 is an enlarged cross sectional view through the bonding clipshown in FIG. 2 after being tightened by a clamping bolt;

FIG. 4 is a plan view of the invention bonding clip assembled to a cableend and anchored to one illustrative type of terminal strip orprotective device;

FIG. 5 is a fragmentary cross sectional view on an enlarged scale takenalong line 5-5 on FIG. 4;

FIG. 6 is a perspective view of the bonding clip before being foldedinto U-configuration; and

FIG. 7 isa cross sectional view similar to FIG. 3 but showing a modifiedembodiment of the bonding clip with the clamping bolt permanentlyassembled to one leg.

Referring initially to FIG. 1, there is shown a typical electrical cable10 having a plurality of conductors 11 enshrouded by a metal shieldingjacket 12 and a tough high strength sheath 13 of non conductivethermoplastic or the like material. In preparing this cable end forattachment of the invention bonding device thereto, the cable sheath andshield is slit several inches lengthwise of the cable, as is indicatedat 14.

The bonding device may be assembled to either a single cable or employedto bond together the shields of two cables at the users election. Forexample, FIG. 2 shows a pair of similar cables 10,10 having theirjackets similarly slit, flattened out and super-imposed against oneanother. It will be noted that the two shield jackets 12,12 faceoutwardly away from one another to either side of the two sheath jackets13,13 which lie back-to-back. The ends of the flattened jacket areformed with a hole 16 spaced inwardly from one edge to accommodate aclamping bolt for the bonding device.

A typical embodiment of the bonding device comprises a U-shape clip 20stamped from sheet metal in a suitable configuration, such as that bestshown in FIG. 6. The outer ends of each leg are there shown as enlargedand formed with an opening 21 spaced equidistantly from a score line 22extending across the mid length of the clip. This score line facilitatesfolding of the clip legs so that the two openings 21, 21 will beaccurately aligned with one another. Surrounding openings 21 along thesame surface of the clip are a multiplicity of sharp edged burrs 24formed in any suitable manner as by perforating the clip from itsopposite face to provide low height but sharp burrs on the inner facethereof. These burrs are so distributed about the opposite ends of theclip as to be misaligned with one another in the assembled position ofthe clip as is made clear by FIGS. 3 and 7.

The described bonding clip is assembled either astride the edge of asingle cable sheath or a pair of sheaths arranged back-to-back, asindicated in FIG. 2, simply by placing the legs over the edge of theflattened sheaths until the holes 21 are in alignment with hole 16. Theclamping bolt or stud 25 is then assembled through the hole and nut 26is tightened causing burrs 24 to penetrate into the underlying surface.If the bonding device is being applied only to a single cable end thenone set of burrs will penetrate and form a firm anchorage with the cablesheath as the other set of burrs penetrates into the thin metalshieldingjacket 12. If a pair of cable sheaths are being anchored together, thenthe burrs on each leg of the clip will penetrate into the juxtaposed oneof the cable shield jackets. In either case it will be appreciated andrecognized that the large area legs of the bonding clip will forciblycompress the cable shield and sheath jackets together over a wide areato provide a high strength mechanical anchorage to the strong cablesheath while forcing the burrs into firm electrical contact with theshield.

Referring to FIGS. 4 and 5, it will be observed that the cable ismechanically anchored to a fixed anchorage as, for example, a terminalstrip 30 by means of the invention bonding device and its clamping bolt25. For this purpose a longer bolt is employed which passes through anopening 31 in the insulative terminal strip. The latter is provided atspaced intervals with conductive terminal lugs 32,33 having clampingscrews 34,35 for connecting individual conductors l1 thereto. A mountingopening 36 can be utilized to anchor the strip to a suitable support,not shown. Terminal strip 32,33 includes clamping screws 38,39 forclamping other conductors to the terminal strips in accordance withcustomary practice.

Attention is also called to FIG. 5 showing clamping bolt 25 for thebonding device utilized to secure a terminal lug 40 for a heavy gaugegrounding conductor 41 to bonding device 20. If desired, lug 40 may beassembled between bonding clip 20 and its clamping nut 26.

FIG. 7 shows a bonding clip 20 having the clamping bolt 25 permanentlyassembled to one leg of the clip. This may be done by providing a highstrength swaged, welded or brazed connection between one end of the bolt25' and one leg of the clip. A swaged connection made in a manner wellknown to persons skilled in the fastener art has been found highlyreliable and satisfactory. Although the holes through which the threadedstud or bolt pass have been shown as having a close fit with the shankit will be understood that sufficient clearance is provided tofacilitate the assembly of the parts with case. It will also beunderstood that a suitable washer is preferably assembled between theclip leg and the clamping nut.

In view of the foregoing it will be appreciated that a highly versatilebonding device and technique has been disclosed which is readilyassembled astride the edge of a shielded cable jacket in such manner asto compress the cable shield and sheath tightly together over a widearea thereby developing the full strength of the cable sheath whileproviding a strong wide-area electrical connection between the bondingclip and the cable shield without risk of damage or rupture of thefragile shield. If an insulative coating is present on the shield thisis penetrated in a multiplicity of places by the sharp burrs 24. It willalso be recognized that the invention bonding clip also provides ahighly effective terminal anchorage for the end of the cable.

While the particular bonding device and anchorage for shielded cablesherein shown and disclosed in detail is fully capable of attaining theobjects and providing the advantages hereinbefore stated, it is to beunderstood that it is merely illustrative of the presently preferredembodiment of the invention and that no limitations are intended to thedetail of construction or design herein shown other than as defined inthe appended claims.

We claim:

I. In combination with a cable having a tough plastic sheath enclosing athin metal shield jacket, a mechanically strong high electrical capacitybonding device designed to utilize the strength of a wide area portionof the cable sheath as a backup support for the cable shield in the areathereof embraced by the bonding device and held forcibly compressedtogether between portions of said bonding device, said device comprisinga wide U-shaped sheet metal clip having an aligned pair of openingsthrough the legs thereof, a multiplicity of sharp burrs projectingtoward one another from the inner faces of each of said legs about saidaligned openings, said cable sheath and shield having aligned openingstherethrough near an edge thereof, said clip embracing the edge of saidcable sheath and shield with the openings thereof aligned with theintervening openings in said sheath and shield, and clamping stud meansassembled through all of said aligned openings holding wide areas ofsaid sheath and shield forcibly compressed together between the legs ofsaid clip with the sharp burrs on one leg penetrating into said sheathand the sharp burrs on the other leg penetrating into said shield tomake multiple electrical contacts therewith, and a conductive groundingmember securely connected to said clip.

2. The combination defined in claim 1 characterized in that said studmeans is permanently secured within the opening in one of said clip legswith its other end extending through the aligned openings in saidsheath, shield and the other leg of said clip.

3. The combination defined in claim 1 characterized in that said studmeans is threaded and provided with a clamping nut for holding saidgrounding conductor and said clip detachably assembled to said cablesheath and shield.

4. That method of electrically and mechanically terminating the end of ashielded electrical cable to an anchorage therefor which comprises:slitting the end of the cable sheath and shield lengthwise from the endof the cable, perforating the flattened sheath and shield inwardly fromthe edge thereof to receive fastener stud means, placing a U-shapedconductive clip astride said sheath edge which clip is provided withsharp burrs projecting from the inner surface thereof, and clamping saidlegs against said sheath and shield and a conductive grounded anchoragefor the cable by said fastener stud means passing through said legs andsaid perforation through the shield and sheath to force said burrs topenetrate into said cable shield.

5. That method defined in claim 4 characterized in the step of anchoringsaid cable sheath to terminal strip means having a plurality ofconductive terminals for individual ones of the cable conductors.

6. That method defined in claim 4 characterized in the step of utilizinga U-shaped clip having sharp burrs along the inner side of each legthereof, and compressing the burrs in one leg thereof into the cableshield and the burrs in the other leg thereof into the cable sheath assaid fastener stud means is forcibly tightened.

7. That method defined in claim 4 characterized in the step of slittingthe shields and sheaths of a pair of electrical cables to facilitateexpansion of a length of the sheath and shield of each away from thecable conductors, forming aligned holes through the shield and sheath ofeach of said cables spaced inwardly of an edge of each, superimposingthe expanded sheaths of said cables against one another with theirshilds facing outwardly and with said holes in registry, placing astud-equipped U-shaped conductive clip astride said shields and sheathsand inserting said stud through said holes and the legs of said clip,providing the inner surfaces of said clip legs with sharp burrs, andclamping said legs together by tightening nut means assembles to saidstud threby to force said burrs to penetrate into the juxtaposed one ofsaid cable shields.

8. That method defined in claim 7 characterized in the step of utilizingsaid stud to clamp said clip and said cable ends to a fixed anchoragefor said cables.

9. That method defined inclaim 7 characterized in the step' ofconnecting a conductive grounding member to said clip thereby to groundeach of said cable shields.

10. That method of mechanically connecting two cable ends together andsimultaneously electrically bonding the cable electrical shields to oneanother which comprises: slitting the cable shields and sheaths andflattening the same with their sheaths against one another and theirshields facing outwardly, forming a hole inwardly of the edge of each ofsaid shields and sheaths, placing a conductive clip astride said edgeswhich clip has burrs facing toward one another along the inner surfacesof each leg, clamping said legs forcibly against said sheaths andshields by tightening fastener means assembled through said legs andsaid holes as said burrs penetrate said shields.

11. That method of providing a high-capacity highstrength bondingconnection to the normally concealed shield jackets of a shielded cablewhich comprises: opening the cable sheath and shield from one endthereof to exposethe conductors and permit flattening a short length ofthe sheath and shield; perforating said sheath and shield inwardly fromthe edge thereof to provide a pair of aligned openings; sandwiching theperforated portions of said sheath and shield between the legs of widearea U-shaped conductive strap means provided with a plurality ofperforations having sharp burrs along the rims thereof and distributedabout openings through said legs aligned with said pair of openingsthrough said shield jacket and sheath; and utilizing high strengthconductive fastener means extending through said aligned openings andthe terminal end of a grounding conductors to clamp said conductor, saidshield, said conductive means and said sheath immovably together withsaid sharp burrs penetrating the adjacent surface of said shield.

12. That method defined in claim 11 characterized in the step ofproviding said conductive strap means with a set of sharp burrs on eachleg thereof so disposed that one set penetrates the juxtaposed surfaceof said shield and the other set of which penetrates the juxtaposedsurface of said sheath as said fastener means is tightened to compresssaid conductive means against the intervening portions of said sheathand shield.

a threaded shank and a threaded nut mateable therewith.

15. That method defined in claim 11 characterized in the steps offorming aligned openings in the free ends of the legs of said U-shapedstrap means and providing the adjacent inner faces of said strap meansin the area surrounding said aligned openings with a multiplicity ofsharp burrs effective to penetrate into said sheath and shield as saidU-shaped strap means is compressed by said fastener means.

16. That method of providing a high strength electrical and mechanicalconnection with the shielding jacket of a sheath-enclosed shielded cablewhich comprises: opening the non-conductive cable sheath and theunderlying conductive shield to expose the cable conductors and toprovide access to the shield, forming aligned openings through saidsheath and shield inwardly from the edge thereof to accommodate fastenermeans, straddling the expanded end portions of said sheath and shieldwith a wide U-shaped clip having a multiplicity of sharp burrsprotruding from the surface of the clip leg closest to the shield,clamping the legs of said clip tightly over the opposite ends of saidaligned openings by conductive fastener means inserted through saidaligned openings and the legs of said clip, thereby forcing saidmultiplicity of sharp burrs to penetrate the surface of said shield assaid clip legs are clamped compressively against said shield and cablesheath by said fastener means.

17. That method defined in claim 16 characterized in the step ofutilizing said fastener means additionally to anchor a heavy gaugegrounding conductor to said fastener and to said U-shaped clip.

18. That method defined in claim 17 characterized in the step ofutilizing said fastener means additionally to clamp said cable sheathand shield firmly to support means.

19. That method of anchoring a shielded cable to a fixed ground supportwhich comprises: opening a length of the cable sheath and shield fromone end to form a flattened anchor tab for the cable lying along oneside thereof, forming aligned openings through the portion of said cablesheath and shield forming said anchor tab inwardly from the edgethereof, assembling the openings in said flattened anchor tab overconductive grounded fastener stud means passing through said fixedsupport with a portion of said shield closely adjacent said stud meansin contact with a plurality of sharp conductive burrs, tightening saidfastener means to compress said sheath and to force said burrs topenetrate into said shield and provide a high strength largeareaanchorage of said flattened anchor tab to said fixed support and amulti-contact pressurized electrical connection between said shield andsaid grounded support.

20. That method defined in claim 19 characterized in the step ofassembling large area conductive plate means over said fastener meansand formed with a multiplicity of sharp burrs on one face thereof facingtoward the surface of said shield in the area surrounding the openingfor said fastener means, and tightening said fastener means to clampsaid plate means between said shield and a portion of said fastenermeans which is grounded.

1. In combination with a cable having a tough plastic sheath enclosing athin metal shield jacket, a mechanically strong high electrical capacitybonding device designed to utilize the strength of a wide area portionof the cable sheath as a backup support for the cable shield in the areathereof embraced by the bonding device and held forcibly compressedtogether between portions of said bonding device, said device comprisinga wide Ushaped sheet metal clip having an aligned pair of openingsthrough the legs thereof, a multiplicity of sharp burrs projectingtoward one another from the inner faces of each of said legs about saidaligned openings, said cable sheath and shield having aligned openingstherethrough near an edge thereof, said clip embracing the edge of saidcable sheath and shield with the openings thereof aligned with theintervening openings in said sheath and shield, and clamping stud meansassembled through all of said aligned openings holding wide areas ofsaid sheath and shield forcibly compressed together between the legs ofsaid clip with the sharp burrs on one leg penetrating into said sheathand the sharp burrs on the other leg penetrating into said shield tomake multiple electrical contacts therewith, and a conductive groundingmember securely connected to said clip.
 2. The combination defined inclaim 1 characterized in that said stud means is permanently securedwithin the opening in one of said clip legs with its other end extendingthrough the aligned openings in said sheath, shield and the other leg ofsaid clip.
 3. The combination defined in claim 1 characterized in thatsaid stud means is threaded and provided with a clamping nut for holdingsaid grounding conductor and said clip detachably assembled to saidcable sheath and shield.
 4. That method of electrically and mechanicallyterminating the end of a shielded electrical cable to an anchoragetherefor which comprises: slitting the end of the cable sheath andshield lengthwise from the end of the cable, perforating the flattenedsheath and shield inwardly from the edge thereof to receive fastenerstud means, placing a U-shaped conductive clip astride said sheath edgewhich clip is provided with sharp burrs projecting from the innersurface thereof, and clamping said legs against said sheath and shieldand a conductive grounded anchorage for the cable by said fastener studmeans passing through said legs and said perforation through the shieldand sheath to force said burrs to penetrate into said cable shield. 5.That method defined in claim 4 characterized in the step of anchoringsaid cable sheath to terminal strip means having a plurality ofconductive terminals for individual ones of the cable conductors. 6.That method defined in claim 4 characterized in the step of utilizing aU-shaped clip having sharp burrs along the inner side of each legthereof, and compressing the burrs in one leg thereof into the cableshield and the burrs in the other leg thereof into the cable sheath assaid fastener stud means is forcibly tightened.
 7. That method definedin claim 4 characterized in the step of slitting the shields and sheathsof a pair of electrical cables to facilitate expansion of a length ofthe sheath and shield of each away from the cable conductors, formingaligned holes through the shield and sheath of each of said cablesspaced inwardly of an edge of each, superimposing the expanded sheathsof said cables against one another with their shilds facing outwardlyand with said holes in registry, placing a stud-equipped U-shapedconductive clip astride said shields and sheaths and inserting said studthrough said holes and the legs of said clip, providing thE innersurfaces of said clip legs with sharp burrs, and clamping said legstogether by tightening nut means assembles to said stud threby to forcesaid burrs to penetrate into the juxtaposed one of said cable shields.8. That method defined in claim 7 characterized in the step of utilizingsaid stud to clamp said clip and said cable ends to a fixed anchoragefor said cables.
 9. That method defined in claim 7 characterized in thestep of connecting a conductive grounding member to said clip thereby toground each of said cable shields.
 10. That method of mechanicallyconnecting two cable ends together and simultaneously electricallybonding the cable electrical shields to one another which comprises:slitting the cable shields and sheaths and flattening the same withtheir sheaths against one another and their shields facing outwardly,forming a hole inwardly of the edge of each of said shields and sheaths,placing a conductive clip astride said edges which clip has burrs facingtoward one another along the inner surfaces of each leg, clamping saidlegs forcibly against said sheaths and shields by tightening fastenermeans assembled through said legs and said holes as said burrs penetratesaid shields.
 11. That method of providing a high-capacity high-strengthbonding connection to the normally concealed shield jackets of ashielded cable which comprises: opening the cable sheath and shield fromone end thereof to expose the conductors and permit flattening a shortlength of the sheath and shield; perforating said sheath and shieldinwardly from the edge thereof to provide a pair of aligned openings;sandwiching the perforated portions of said sheath and shield betweenthe legs of wide area U-shaped conductive strap means provided with aplurality of perforations having sharp burrs along the rims thereof anddistributed about openings through said legs aligned with said pair ofopenings through said shield jacket and sheath; and utilizing highstrength conductive fastener means extending through said alignedopenings and the terminal end of a grounding conductors to clamp saidconductor, said shield, said conductive means and said sheath immovablytogether with said sharp burrs penetrating the adjacent surface of saidshield.
 12. That method defined in claim 11 characterized in the step ofproviding said conductive strap means with a set of sharp burrs on eachleg thereof so disposed that one set penetrates the juxtaposed surfaceof said shield and the other set of which penetrates the juxtaposedsurface of said sheath as said fastener means is tightened to compresssaid conductive means against the intervening portions of said sheathand shield.
 13. That method defined in claim 11 characterized in thestep of utilizing said fastener means to anchor said sheath and shieldto an anchorage for said cable.
 14. That method defined in claim 11characterized in the step of utilizing fastener means of the type havinga threaded shank and a threaded nut mateable therewith.
 15. That methoddefined in claim 11 characterized in the steps of forming alignedopenings in the free ends of the legs of said U-shaped strap means andproviding the adjacent inner faces of said strap means in the areasurrounding said aligned openings with a multiplicity of sharp burrseffective to penetrate into said sheath and shield as said U-shapedstrap means is compressed by said fastener means.
 16. That method ofproviding a high strength electrical and mechanical connection with theshielding jacket of a sheath-enclosed shielded cable which comprises:opening the non-conductive cable sheath and the underlying conductiveshield to expose the cable conductors and to provide access to theshield, forming aligned openings through said sheath and shield inwardlyfrom the edge thereof to accommodate fastener means, straddling theexpanded end portions of said sheath and shield with a wide U-shapedclip having a multiplicity of sharp burrs protruding from the surface ofthe clip leg Closest to the shield, clamping the legs of said cliptightly over the opposite ends of said aligned openings by conductivefastener means inserted through said aligned openings and the legs ofsaid clip, thereby forcing said multiplicity of sharp burrs to penetratethe surface of said shield as said clip legs are clamped compressivelyagainst said shield and cable sheath by said fastener means.
 17. Thatmethod defined in claim 16 characterized in the step of utilizing saidfastener means additionally to anchor a heavy gauge grounding conductorto said fastener and to said U-shaped clip.
 18. That method defined inclaim 17 characterized in the step of utilizing said fastener meansadditionally to clamp said cable sheath and shield firmly to supportmeans.
 19. That method of anchoring a shielded cable to a fixed groundsupport which comprises: opening a length of the cable sheath and shieldfrom one end to form a flattened anchor tab for the cable lying alongone side thereof, forming aligned openings through the portion of saidcable sheath and shield forming said anchor tab inwardly from the edgethereof, assembling the openings in said flattened anchor tab overconductive grounded fastener stud means passing through said fixedsupport with a portion of said shield closely adjacent said stud meansin contact with a plurality of sharp conductive burrs, tightening saidfastener means to compress said sheath and to force said burrs topenetrate into said shield and provide a high strength large-areaanchorage of said flattened anchor tab to said fixed support and amulti-contact pressurized electrical connection between said shield andsaid grounded support.
 20. That method defined in claim 19 characterizedin the step of assembling large area conductive plate means over saidfastener means and formed with a multiplicity of sharp burrs on one facethereof facing toward the surface of said shield in the area surroundingthe opening for said fastener means, and tightening said fastener meansto clamp said plate means between said shield and a portion of saidfastener means which is grounded.